What is appliance loss?

• A. Pressure loss caused by weather patterns
• B. Pressure loss caused by valves, gates, adapters, and other fittings in the hose assembly
• C. Loss due to water freezing
• D. Flow rate increase due to friction

Answer: (B)

Appliance loss is the pressure drop that occurs as water flows through the hose fittings and appliances—valves, gates, adapters, elbows, reducers, and other fittings in the hose assembly. Each fitting creates resistance, so the more fittings or the more complex the hose setup, the more pressure is lost. This loss is separate from friction loss, which comes from water rubbing along the inside of the hose itself. When calculating the needed pump pressure to achieve the desired nozzle pressure, you must account for both friction loss and appliance loss. The other options describe effects or situations that aren’t about pressure loss caused by hose fittings.